Silicon Laboratories Stepper Machine Uživatelský manuál stáhnout pdf (Strana 32)

AN428

32 Rev. 0.6

}

}

else {} // If this transfer is a READ,

// then take no action. Slave

// address was transmitted. A

// separate 'case' is defined

// for data byte recieved.

}

else // If slave NACK,

{

if(SMB_ACKPOLL)

{

STA = 1; // Restart transfer

}

else

{

FAIL = 1; // Indicate failed transfer

} // and handle at end of ISR

}

break;

// Master Receiver: byte received

case SMB_MRDB:

if ( i < SMB_DATA_LEN ) // Is there any data remaining?

{

*pSMB_DATA_IN = SMB0DAT; // Store received byte

pSMB_DATA_IN++; // Increment data in pointer

i++; // Increment number of bytes received

ACK = 1; // Set ACK bit (may be cleared later

// in the code)

}

if (i == SMB_DATA_LEN) // This is the last byte

{

ACK = 0; // Send NACK to indicate last byte

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